Physics
If the length of a simple pendulum is halved then its period of oscillation is

Increased by a factor 2
Halved
Decreased by a factor 2
Doubled

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Physics
The blue colour of water in the sea is due to

Reflection of blue sky by sea water
Scattering of blue light by water molecules
Absorption of other colours except blue by water molecules
Reflection of blue light by impurities in sea water

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